HST apply for anything (non gift) more than $20 value. or GIFT more than $50 value. Duty may also apply for something not duty free (such as Tire made in Japan).
USPS preferred for small items. The brokerage fee is only $5 .
UPS is the worst and Fedex is the 2nd worst , but you'd better use them for move valuable items. Both charge high brokerage fee.